The World Bank's 300 page book, Who Benefits from Utility Subsidies [pdf] conducts a detailed analysis and concludes that "the vast majority of utility subsidies practiced today are regressive." Policy recommendations include emphasis on connecting people to the grid, subsidizing only a small quantity of consumption, and shifting subsidies out of utilities and into other social programs (e.g., education, health, etc.). The book is from 2005, but the message is for now